Falling-drum water clock, c 1700.

Falling-drum water clock, c 1700.

Praxinoscope, 1878.

Mufax chart recorder type D-665-C, 1969.

Shelford Bidwell's picture transmitter and receiver, 1881.

Shelford Bidwell's picture transmitter and receiver, 1881.

Stereoscopic spark drum camera, French, 1903.

Stereoscopic spark drum camera, French, 1903.

Stereoscopic spark drum camera, French, 190

Wall telephone with Edison chalk receiver, early 20th century.

"Pye 'Ranger' VHF radio telephone set, c 1960s."

Praxinoscope, 1878.